Opposition leader Sam Rainsy and his deputy Kem Sokha met hundreds of supporters in Siem Reap province after authorities banned anti-government rallies in the capital and renewed calls for Hun Sen to resign over alleged vote fraud in July 2013 polls.

"If he does not agree to a new election, we will start the final campaign. That will be to make him step down," Kem Sokha told a cheering crowd, according to a live stream from the rally on his Cambodia National Rescue Party website.

Authorities chased opposition protesters from their rally site in the capital Phnom Penh on Saturday and banned all anti-government demonstrations indefinitely after bloody clashes between striking garment workers and security forces that saw police shoot several people dead.